megasquirt
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Megasquirt 2 - External wiring layouts
V3.0 / V3.57 External wiring This is a general external wiring layout. See the ignition hardware manual for details on controlling different ignition systems and the DIY options for multiple spark outputs. SPR1,2,3,4 and IAC1A,1B,2A,2B are not connected to anything as standard - there are solder-pads on the circuit board inside the case that you can DIY connect to input and output circuits of your choice. When using 4-wire stepper idle, the IAC wires should be jumpered on the circuit board to the corresponding IAC pads under the CPU and jumper S12C-JS9. For CAN, jumper SPR1-JS6, SPR2-JS8 V3.0 board requires a DIY modification to directly control a 2-wire PWM idle valve as shown.